Amplifying-tube.



Fw BOSWELL.

AMPLIFYIJG TUBE.

APPLICATION FILED SEPT. 26, 1910.

997,265 mente@ July 11,1911.

2 SHEETS-SHEET l.

MJWZZ,

` @Mommy R. AL BOSWELL.

AMPLIFYING TUBE.

APPLICATION-FILED SEPT.26,1910.

Patented July l1, 1911.

2 SHEETSA-SHBET 2.

@Witt 1 c so un To all whwo'it may El/@BERT A. BGSWELL, @E VLP'ASHINGTODL DISTRICT OF COLUMBKA.

lloIPLFYING-TUBE.

.application September 2G, 1910.

Speoiicatien of Letters Patent.

Serial Re. 583,704.

er. the United States of Am lashinU-ton city, District las in-:ented a. new and Ampli.Lying-Tube, of which the following is a specitication.

' rlhis invention is classified in the art of acoustics, andit essentially pertainsto a new Iand useful amplifying tube or horn, adapted lfor use upon a talking machine of a type which is generally known as the cylinder machine.

lnmachines of the cylinder type, prior to this invention, the bell portin of the ma,- jority" of the amplifying tubes is pivotally supported, while the smaller portion of the tube has a pivotal or swiveled connection with the `reproducer in such Wise as to allow the amplifying tube or horn to oscillate, as the reproducer is fed along the record. This structure of machine, it has been held, in some respects, is uri-symmetrical, awkward and clumsy,and, the basic purpose of this invention is to eliminate these objectionable features,` and furthermore, to improve the structural details. of the4 amplifier. By im- Aproving such structural details, the sound,

to some extent, is increased, because of the length vtravel (which has been increased beyond tliat heretofore utilized) of the volume of sound through the amplifier (thepgreater portion of which is restricted to a very small diameter in cross section). The yvolume of sound, when passing through this restricted portionof the amplifier, is held constricted until it reaches a point. where the amplifier begins to enlarge into the bell portion thereof. ln eliminating the objectionable features, a n amplifier o'r tube is produced, which travels laterally of the record, and, as one body withthe reproducer and its arm the Vamplifier being so shaped, mounted, and

supported as to allow the reproducer to be raised, and, in so doing, the tone-arm is moved telescopically and longitudinally with regard to the remainder of the amplitier. This amplifier comprises an intermedi ate Supported' portion, known as the compound curved tubular member, and two free end portions,correspondingly curved, telescopically and longitudinally movablelin regard thereto, one Alassed as the bell member, While 'the otlnf is the tone arm. The bell member,fhowever, cannot only move telesc0pically, with. Vrelation to the compound curved member, but may be oscillated laterally, because it is provided with a contracted curved portion, which is telescopicall y movable with regard to a tubular member correspondingly curved. This tubular member. in other words, is an additional compoimd curved member, which is telescopi/cally movable with regard to the firstnamed c nipound curved tubular member. In Figure (5, however, the bell member 'is allowed to oscillate laterally, because it Consists of two parts, the bell member and the extension thereof, joined together by one, two or three threads; the extension being,- telescopically movable relatively to the eompound curved tubular member, for instance, the first-mentioned compound curved member. This same structure is shown also in Figure 5 in side elevation. The invention not only embraces the above features, but embodies means, whereby as the bell member is raised and lowered, the extension thereof moves exactly concentric in conjunction with the compound curved member, and may be f. held in any desired position.

Then the reproducer is lifted to the fullest extent above the record, it may be readily supported, as shown in dotted lines.

The drawing,r only discloses one form of the invention, but in practical fields this form may necessitate changes and alterations. to which the applicant is entitled, provided such changes and alterations are comprehended by the appended claims.

Referring to the drawings,

Figure l is a side elevation of a talking machine, generally known as the cylinder machine, provided with whatl is known in the art as the compound curved tubular member. for the support of the free moving parts of the amplifier.

Figure 2 a detail perspective view of the connection between the reproducen arm, the guide rod therefor, the sleeve upon the guide rod` and the connection between the sleeve and the compound curved tubular member.

Figure 3 is a detail sectional view longitudinally through the Structure shown in Figure Figure 4 is a top plan view of the amplifier, Y showing the first -named compound curved tubular member, the tone arm, tlie bell memberhaving a curved portion at its contracted vend, and the extension or secondnamed compound curved tubular member. correspondingly curved with regard to the Patented Silly if, i911.

threaded connection between the extei i .portion o' the tone arm, a portion of the beit member its extension, showing' and the heil member, and clearly disclcs ng the fact that these parts are teleeeopically movable with regard to one another, and further showing the means whereby the ef;- tension and the bell member may move ei:- actly concentric With regard to the compound urved member,

Figure G is a top plan view ot the structure shown in Figure 5.

Figure 7 is a detail elevation of the joint or connection between the extension or' the second-named compound curved tubular member and the y first-named compound curved tubular member.

Figure 8 is a side elevation of the same form of machine as shown in Figure l, only illustratingthe fact that the bell member has a curved contracted end portion and t'ulerumed upon the reproducer arm, and showing that the curved contracted portion is telvescopically movable with regard to the tone arm.

Figure 9 is a sectional view on line 5)*9 ot Figure 5.

As tothe drawings, l denotes the casing ot'- the talking machine, containing the usual mechanism, (not shown), for rotating the record and the mandrel; the structure of the mandrel forms no part of the present inventionj In mountino an amplifier' upon this style of machine, the saine necessarily has to be moved laterally, and as one body, with the reproducer and its arm. rfhis lateral. movement is acomplished by disposing of the usual torm ot' guide rod (which is usually arranged.V This rod 2 is rectangular in cross section, and receives the slceye 3. This sleeve 3 is slidable laterally upon the rod 2, for the reason that it is provided With a recA tangular bore '1-. ri`he ends of the rod l may he supported in bearings of the frame ot the machine in any conventional manner, as shown at' lt is to/ be understood that in practice the ends of this rod mustbe so mounted as to allow the same to be removed, for instance, the ends of this rod may only have suliicient trictional bearings in the frame of the machinev` of such a character as to allow the same to be readily moved by forcing a slidiimaction thereto. The outside circumference of the vsleeve is cylindrical in order to provide a pivotal hearing for the reproducer arm (3, and is provided at one end with threads 7, to receive ment, lateraliy, of the reprodueer arm. Wiil be readiiy understood that the reproducerarm may be easily raised and lowered upon the sleeve. i one end of the sleeve, an arm 9 rearwaroly projects, andv Where this arm forms a partot the Sleeve, a shoulder l@ is pr, vided, against which the reproducer arm t3 abats. Bettini this shoulder and the nut, the reproducer arm is positioned. rhe rea1.\'ardly prf ji,`ecting arm l rearwardly suiiicient to allow the reproducer arm to swing or oscillate upon an arc o't a circle, using 'the rod 2 as a cem'ier. The rearwardly extending` arm 9 connects with the. compound curved tubular member l1. This connection between the arm't) and the member il may be integral, as shown in Figure l,

detachable, as shown in Figure 5. it made detachable, the arm 9 and the .arm 12 are made in one piece, and where they projectfrom the compound curved tubular member, they are recessed to receive the said member 1l, and are clamped to the member 11 by the plate 1 3.

The reproducer arm G carries the usual form of reproducer ist, to which is connected the tone arm l5. by means ot the threaded connection i6. rthis tone arm l5 is corrspondingly ,:urved with regard to the compound curved tubular member lli, in order that when the reproducer and its arm is lifted or raised from the record, the tone arm Will tclescopically move relatively to the curved member ll. TWhen the reprosame is supported in such position by the slight curve 17 of the tone arm coming in Contact with the upper for 'ard end 18 of the member ll, as shown in doted lines in Figure 1. l5) represents th bell member ot the amplifier having a contracted end portion 20, which terminates into a curved portion or neck Q1. denotes lan additional l compouml curved tubular member, thev poreylindrical) and in its place the rod 2 g tion Q3 ot which is correspondingly curved with relation to the eurved'portion or neck 21, and is designed to telescopically receive said portion or neck'l, while the portion 24 member is curved correspondingly with regard to the first-named compound curved tubular member and is received thereby. The compound curved tubular member 11 is similar to the arm 12 in Figure it being possible to mount the arm in the same manner as the arms t) and l2 are mounted on the said member 11. This arm Q5 extends to a point, marked 2T on which the arc of a portion of the member ll, and the portion M- of the member 92 are curved. The eX- tremities of the arms Q5 and l2 are bifurcated, as shown clearly in Figures l, (3 and 7, in order to receive the extremity ot the arm the threaded nut S, which prevents displace- QG, or it may be plain, :is-shown in Figures 'l t) extends v ducer and its arm raised or lifted, the

ot' the additional compound curved tubular in Figure 1 is formed with an armQ (which and 5, and the extremities of the arms 25 and 12 and `the arm 2G elan'iped together by means ot a bolt and winged nut 2T and 23. When the. arms 25 and having the bifurcated portion receive. the extremity ot the arm 2G, they are clamped in pcsitioii by the aid of the bolt 29 and the winged mit HOL as shown clearly in i-vigures et. t3 and .7, thereby holding the bell member, and the additi il Compound curved tubular member in v. ons positions. By the production ot' these cooperating arms or 12 and 'the arm 2G, the bell member and the extension the-.remi or the additional compound curved member 22 may be moved or oscillzied exactly concentric with regard to the centers. The arm 2G may be detachably connected with the portion 24, in the same manner as the arms 0 and l2 are connected in Figure 5.

Attention is directed to the structure shown in Figure 5, in which the bell member 19 has its contracted portion 20 teri'ni-natingl in a downwardly curved portion or neck 31. This downwardly curved portion 31 has threaded connections with the extension 32 of the bell member, as at- 33, whereby the bell member may be allowed to oscillate laterally of the machine. This extension 32 is curved correspondingly with regard to the member 11 and is telescopically received thereby, so thatthe bell* member may be raised or lowered. When the bell member 1) is raised or lowered, the same may be held in various positions by .tightening up the winged not 30, or' the winged nut .28 in Figure 5. It will be evident. upon referring to Figure 5 that the aini 26 may be connected to the extension at any suitable location, in practice, in order that the throw of the bell member may be increased or decreased.

I t Will be observed that when it is desired' to adjust the bell member 19 in Figure 1, the curved neck 21 cooperates with the portion 23 of the additional compound. curved member 22. It will be evident that this portion 23 in practice may be changed somewhat in shape to vary the lateral oscillation ot' the bell member.. The bell member is limited in its oscillation by the contracted portion 2O lcoming in Contact with the extremity of the curved portion-23, when moving in one direction, and when in the other direction, the contracted portion 20y contacts at the point 35, where the portion 23 merges into the portion 24 of'theadditional compound curred tubul a r, member. 25 and 26 may be provided-to cooperate with the contracted portion 20 of the bell member and the curved portion 23, in order to cause rthe .bell member to oseillate exactly concentric with the center of the neck 21 and the'portion 23. l.

It is further evident that the forward weight of the bell member is directly above' thebody of the machine .and its casing,

Armssimilar to the armsv which equally balances with the reaiwvardly extending portions ot' the ainplilier or the telescopicaliy connected sections. In this manner. the equilibrium ot the machine-is readily iiiaintained.

in Figui-e S the tone arm 15 is connected to the rcnrodueer 'il in the same manner as shown in lf`igui-e. 1. forinstance by a threaded eonnec i, and designated by the same charac 1G. The bell member 1E) terminates` into a eurif'ed' portion orineclr 36, which correspondingly curved with regard to the tone arm 15, and is received thereby. The bell inem ier is provided -with an arm Si', which may be integral or detachably coni'iected therewith. The reproducer aria. il in VFigui-eti is formed with an aria 3S. This arm 35 is provided with the bi'iiui'cated end similar to the arms 25 and\12, asshown clearly in Figure "if, and in the biturcated portion of this arm 38 the eX- tremity of the arm 37 is disposed. The bi- 't'uicated end ot the arm 38 and the extremity of the arm 37 have' a bolt 39 penetrating them, and to the threaded end of the bolt. the winged nut 40 is applied. The bolt 39 is similar to the bolt 29 in Figure 7. As the bell member 19 is raised or lowered, the curved' portion or neck 3G moves telescopically with regard to the tone arm 15, and exactly concentric therewith, because of the connections between the arms 37 and 38. It may be clearly noted how the 'various structures in the drawings are operated.

'. The curved portion or neck 21 `and the curved portion 23 are provided with pivoted cooperating-arms 42 and 43 similar to the arms 25 and 2G. These arms are connected by a bolt and a winged nut 44 and 45.

In order to assemble the portions 21 and 23, the portion 21 is made in two parts 46 and 47, the part 47 being rst inserted in the portion 23,' atterwhich the part 4G is telescopically connected to it vby a beveled joint, and then'securely soldered or otherwise fastened or made permanent. This is only one method of assembling the portions 21 and 23, it Y bein evident that other methods may be emp oyed.

The invention having been set forth, what is cla'imed as new and iiseful is 1. A'laterally movable amplifying horn; comprising a compound curved tubular member; and telescopically movable free tie portions correspondingly curved and supported `from either end or the member.

2. A laterally movable amplifier; com prising compound curved tubular member; teleseopieally movable free portions correspondingly curved and supported from either end of the member; and means permitting one of the free portions to move coneentrically with regard to the member.

3, A laterally movable amplifying horn; Comprising a compound Curved tubular member; telescopieally movable free portions correspondingly curved and 'supported from either end ot the member; and means permitting the adjustment and support of either ot the free portions in various positions.

1. A laterally movable amplifier; comA pri'sing al compound curved tubular member; telescopically movable tree portions correspondingly curved and supported ltrom either end of the member; means permitting one or' the free portions to move coneentri cally? with regard to the member; the means including means Ytor allowing the adjustinenft and support ot one of the tree portions in various positions.

5. ln an amplifier; a compound curved tubular member; and a free end portion having telescopieally movable connecting means with the member, whereby the tree end portion may have universal movements.

6. ln an amplifier; a compound curved tubular member; and a free end portion having telescopic connecting means with the member; whereby the free end portion may have universal movements; and means permitting the free end portion to move concentrically With regard to the member.

7. ln an amplifier; a compound curved tubular member; a free end portion having telescopically movable connections with the member, whereby the free portion may oscillate laterally and vertically; means pen mitting the tree end portion to move con- -eentrically with regard to the member; the

means including;l means for holding the free end portion in adjusted positions when moved.

8. ln an amplifier; a eonipomid curved tubular member; an additional compound curved tubular member teleseopically united with the first tubular member; a tree end portionfhaving an extension correspondingly curved with regard to the additional compound curved member and tcleseopically connected to it; said additional eompound curved member' constituting a medium to permit lthe 'free end portion to oscillate laterallyv and vertically. f

V9. ln an amplifier; a compound curved tubular member; au. additional compound curved tubular member telescopically united with the first tubular member; a free end portion having an extension correspondl ingly curved with regard to the additional compound curved member and telescopically connected to it; said additional compound curved member constitutingT a medium to permit the Ytree end portion to oscillate lat the tree end portion and the additional compound curved member to move concentrieally with regard to one another.

l0. ln an amplilier; a compound curved tubular member; an additional compound curved tubular member telescopically united to the first tubular member; a tree end portion having an extension correspondingly curved with regard to the additional compound curved member and telescopically united to it; the additional compound curved member constituting a` medium to permit the free end portion to oscillate universally; means permitting` the free end p0rt'ion; when oscillated in one direction= to move concentrically with regard to one member and, when oscillated in the other direction, to move concentrically with regard to the other member; the means including means to hold .either the ,additional compound curved member or the free p0rtion in adjusted positions.

ll. ln an amplifier; a compound curved tubular member; a tree portion having connections with the member; thel connections embodying correspondinglymcurved telescopically movable. united parts to permit the tree portion' to move universally through the medium olE the parts; the connections including 'means whereby the tree portion may move concentrically with regard to the member.

l2. ln/an amplifier; a compound curved tubular member; a free portion having lcon.- neetions with the member; the connections embodying correspondingly curved tele scopieally movable united parts to permit the free portion to move univers-ally through the medium of the parts; the connections includ-ing means whereby the free portion may move concentrically with regard to the member; the means for permitting the tree portion to move conccntrically embodying means to hold the free portion in various adjusted positions.

lil. ln an amplifier; a compound curved tubular member; an additional compound curved tubular member telescopically united with the first tubular member; a 'tree end portion having an extensioncorresp(mdingly curved in regard to the additional compound curved member and telcscopicall'v .united to it; the additional compound curved member constituting aimedium to permit the tree endv portion to oscillate universally; means pern'iitting the free end portion and the additional compound curved member to mive concentrically with regard to one another; and means permitting the orally and vertically; and means permitting additional compound curved member to comprising ,a compound `curved tubular member; movable free portions, Correspond-v ingly curved and telesopically connected to the member to have longitudinal telescopical movements therewith, one.A of the free portions embodying such connections with the member as to permit the Same to oscillate universally; means permittingone of the free portions to move concentrically with regard to the member, and including means to hold one of the free portions in its adjusted positions.

In Witness whereof, the applicants signa.- tur-e, is hereunto affixed in the presence of two Witnesses.

ROBERT A. BOSVELL Witnesses: V

HERBERT D. LAWSON, VILELAM CRIoH'roN CLARKE. 

